Abstract
An automated continuous-flow method with on-line UV digestion for the determination of total nitrogen in waste water and surface water is described. The method is based on the digestion of nitrogen by potassium peroxodisulphate catalysed by UV radiation and detected as nitrite (reaction with sulfanilamide and α-naphthylethylenediamine dihydrochloride). This method was compared with the conventional Kjeldahl method based on the Dutch NEN 6481 standard. No significant differences were found between the two methods for surface and waste waters. The proposed method is suitable for waste water samples with a high nitrate content whereas the Kjeldahl method is not suitable for this type of samples. Further advantages of the proposed method are its fast response, less pollution, safer operation, and the need for fewer laboratory staff and less space.
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